RPD Review Questions

Answer to Question #19

The answer is FALSE

Because tooth-supported RPDs do not exhibit movement toward the tissues during function, physiologic relief is not necessary. Extension RPDs, on the other hand, do exhibit functional movement and do require physiologic relief. This is accomplished as follows: first coat the guide plates with chloroform and rouge or another disclosing medium, seat the framework in the mouth, and push toward the tissues over the extension areas; then relieve the guide plate with a fine textured stone. Repeat as necessary. It is very important that the guide plates do not bind against the abutments during functional movement --- otherwise they will pre-empt the planned mesial rests.